fol·ly /ˈfɑli/
  愚蠢,荒唐事,輕鬆歌舞劇,諷刺劇
  Fol·ly n.; pl. Follies
  1. The state of being foolish; want of good sense; levity, weakness, or derangement of mind.
  2. A foolish act; an inconsiderate or thoughtless procedure; weak or light-minded conduct; foolery.
               What folly 'tis to hazard life for ill.   --Shak.
  3. Scandalous crime; sin; specifically, as applied to a woman, wantonness.
     [Achan] wrought folly in Israel.   --Josh. vii. 15.
     When lovely woman stoops to folly.   --Goldsmith.
  4. The result of a foolish action or enterprise.
      It is called this man's or that man's =\“folly,” and name of the foolish builder is thus kept alive for long after years.\=   --Trench.
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  folly
       n 1: the trait of acting stupidly or rashly [syn: foolishness,
            unwiseness] [ant: wisdom]
       2: a stupid mistake [syn: stupidity, betise, foolishness,
           imbecility]
       3: the quality of being rash and foolish [syn: foolishness, craziness]
       4: foolish or senseless behavior [syn: foolery, tomfoolery,
           craziness, lunacy, indulgence]